Classes and Interfaces

Question 1

Where can class definitions go in your source code?

Question 2

Where can interface definitions go in your source code?

Question 3

Where can interface definitions go in your source code?

Question 4

True or false?: a class definition requires a code block.

Question 5

I have a class definition. Now what?

Question 6

What is a constructor?

Question 7

How can you tell something is a constructor? (Which syntax gives it away?)

Question 8

Can a class contain multiple constructors?

Question 9

How can I use a class without a constructor?

Question 10

True or false?: classes are types.

Answer 10

True

Question 11

True or false?: interfaces are types.

Answer 11

True

Question 12

Can I assign the value of a variable declared as an interface to a variable declared as a class?

Question 13

Can I assign the value of a variable declared as a class to a variable declared as an interface?

Question 14

What problem does an interface solve that isn’t solved by a class?

Question 15

What is an abstract class? What problem does it solve that isn’t solved by an interface or non-abstract class?

Question 16

What is the naming convention for classes?

Question 17

What is the naming convention for interfaces?

Question 18

Can class definitions be nested?

Question 19

What is the maximum number of methods a class should contain?

Question 20

What is the keyword for interfaces?

Answer 20

implements